Lam, Huen Sum, Siu Yin Cheung, and Bik Chu Chow. “The Effects of Tai-Chi-Soft-Ball Training on Physical Functional Health of Chinese Older Adult”. Journal of Human Sport and Exercise 6, no. 3 (October 10, 2011): 540–553. Accessed April 18, 2024. https://www.jhse.ua.es/article/view/2011-v6-n3-the-effects-of-tai-chi-soft-ball-training-on-physical.